Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Category
Mineral (Synthetic)
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Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granite
Intrusive igneous rock
igneous
Gneiss
Gneiss
metamorphic
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fossil bone, possibly a large mammal long-bone fragment
Fossilized cortical bone; taxon indeterminate from the photograph
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Granite
Phaneritic Plutonic Felsic Rock
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral